Motor-operated chuck



Jan. 9, 1923. 1,441,803. H. M. HAY.

MOTOR OPERATED CHUCK.

FILED MAY 8,1922. 2 smarwsmcr l.

Elm 0W,

Jan. 9, 1923.,

H. M. HAY.

MOTOR OPERATED CHUCK.

2 SHEETS-SHEET Z.

FILED MAY 8.1922.

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UhRD lltfllltlltlhl' .ItlhW, Uh WENON, NEW JERSEY,

MUTU-UPEEATEJD CHUC.

application tiled lltay ll,

To all whom it may concern: 7

Be it known that l, Howann MORTON HAY, a citizen of the United States,residing at Wenonah, in the county of Gloucester and State of NewJersey, have invented certain new and useful Improvements inMotor-@perated Chucks, of which the following is a specification.

This invention relates to improvements in power operated chucks forlathes, boring machines and the like. In my co-pending applicationSerial No. 545,608, filed March 21,- 1922, T have shown means foroperating the jaws of a chuck, while the latter is running or stopped,by power ap lied through a shaft mounted in fixed hearings and driven bya suitable motor, the operating means for the jaws including ashaft orplunger rotatable with the lathe spindle and movable longitudinallytherein to actuate the jaws through levers in the chuck. In

the present invention, provide means whereby the shaft withinthe spindlemay he rotated, by power or by hand, relatively to the spindle, whilethe chuck is running or stopped and: this relative movement of the shaftis utilized to operate the chuck jaws through a scroll plate on thechuck, or it may be utilized to operate the chuck jaws through variouswell known intermediate devices in the chuck.

ln the accompanying drawing,

Fig. 1 is a side elevation, partly in 0811- tral section, of a lathehead and chuck, with hollow spindle equipped with myimprovements foroperating the chuck jaws;

Fig. 2 is a section on the line 2-2 of hi 1" I ll igf3 is a section onthe line 33 of Fig. 1; and, v

Fig. i is a side elevation of the travellng ring for supporting the idlepinions.

Referring to the drawing, a indicatesa lathe head having bearings 1 and2, 1n which is mounted a hollow lathe spindle; 3, carrying the chuck b.The splndle carries the usual driving pulleys a, and has the shoulders 5and 6 which are usually provided on opposite sides of the mam bearings1, for taking the end,thrust of the spindle. Within the spindle isarranged a hollow shaft or sleeve 7, having on ts forward end a gear 8,which meshes with one or more pimons 9 arranged within the body of thechuck and engaging an internal gear 10, on a scroll plate 11. The aws 121922. Serial No. 559,390.

of the chuck are provided with teeth 12 which enter the groove in thescroll plate,

and when the latter is turned with respect W to the chuck body, the jawswill be moved radially to grip or release the work in well known manner.The lathe spindle projects through the bearing 2 into a casing c, whichis secured to the lathe head, and a gear 13 (Figs. 1 and 3) is keyedtothe spindle and arranged within the casing. The-shaft or sleeve 7projects into the casing beyond the end of the spindle and carries agear 14 of the same pitch diameter as the gear 13, the

and an adjustable annular rack 16 is arranged within the casing-in theplane of the gear 14;. A traveling ring 17 is mounted between the gears13 and 15 on the one side and the gears l t and 16 on the other side,and this ring carries a plurality of short shafts or studs 18 whichprojectto equal distances on the opposite sides of the ring. Upon eachof these shafts is rotatably mounted a pinion 19 which meshes with thegear 13 and the rack 15, and a pinion 20 which meshes with the gear 14Land the rack 16.

The adjustable annular rack 16 has the internal teeth 16 which engagethe pinions 20 and also external teeth 16 which are engaged by a pinion21 upon a shaft 22 which projects through the casing c and is driventhrough a lost motion coupling 03 by an electric motor m, the latterbeing mounted upon a bracket 23, secured to the front side of the lathehead; The shaft 22-may be turned hy the motor or by a hand wheel 24,which is mounted upon an extension of the armature shaft of. the motor.

Tn operation, assuming the lathe spindle 1 to be turning by powerapplied to one of the pulleys l,- the gears 13 and 14L, on thespindleand shaft, respectively, will turn inunison.

The pinions 19 and 20, which engage the 105 motor will be started,through suitable switch mechanism, not shown, and this will llf, now, itis de m cause the adjustable rack 16 to move about its axis relativelyto the stationary rack 15, causing an acceleration or retardation of thespeed of the pinions 20 about their axes, and consequently anadvancement or retardation of the gear 14 with respect to the gear 13.Hence, the sleeve 7 will be turned about its axis relatively to thespindle 3, and the gear 8 on the sleeve will turn the pinion 9, which ismounted upon the chuck body, and the latter pinion, by reason' of itsengagement with the gear 10 on the scroll plate, will cause the latterto turn'with respect to the chuck body and move the jaws inward oroutward ac-' cording to thedirection in which the armature of the motorm is turned. If the motor armature is operated in one direction, thejaws will be moved inward, and if the motor armature is turned in theopposite direction, the jaws will be moved outward, and this isaccomplished without stopping the rotat1on of the chuck. It will beunderstood that the motor armature will be stopped when the jaws havefirmly gripped the work, and also when the jaws have been released fromthe vwork. When the lathe spindle and chuck are stationary, theoperation of adjusting the jaws inward or outward, by power or by hand,will be substantially the same asabove described. In the latter case,the gear 13 will be held stationary by the spindle and the gear 14 onthe sleeve or hollow shaft will be moved relatively to the gear 13 bythe adjustment of the rack 16. This movement of the shaft relatively tothe spindle will causethe actuation of the jaws.

By the arrangement described, I am able to use a stationary motor foroperating the chuck jaws while the chuck is in motion as well as whilestopped. The mechanism for actuating the jaws does not interfere withthe extension of the work through the spindle. While it is desirable toemploy a hollow shaft within the spindle, to avoid interference with thework, it will be understood that a sold shaft may be used, if desired.

The gearing might be arranged on the same side of the bearings as thechuck, but by arranging'the aring on one side of the bearingsand the cliilck on the other side,-the overhang of the chuck is reduced and theload on the spindle is balanced. I have shown a chuck of the gearedscroll type, but it, will be understood that the invention is applicableto other types of chuck.

The provision of a hand wheel on the motor shaft enables the operator tomanually actuate the chuck jaws in case the power fa ls, and it alsoenables the operator to lesspindle and a chuck thereon. of a shaftjournaled in the spindle, connections between the shaft and chuck jawsfor operating the lat ter when the shaft is rotated relatively to thechuck jaws, gearing between the spindle and shaft for causing saidspindle and shaft to rotate in unison, said gearing including twonormally stationary annular racks, one of which is adjustable to causerotation of the shaft relatively to the spindle, and .a motor geared tothe latter rack.

2. The combination with a hollow lathe spindle and a chuck thereon, thelatter having a scroll plate for operating the chuck jaws, of a shaftjournaled in the spindle and geared to said scroll plate, gearingbetween the spindle and shaf for causing said spindle and shaft torotate in unison, said gearing including two normally stationary annularracks, one of which is adjustable to cause rotation of the shaftrelatively to the spindle, and a motor geared to the. latter rack.

The combination with a lathe head having bearings, a hollow spindleprojecting through the bearings and a chuck on said spindle at one sideof the bearings, of a shaft journaled in and extending through thespindle, connections between the shaft and chuck jaws for operating thelatter when the shaft is rotated relatively to the chuck jaws, gearingbetween the spindle and shaft, at the other side of the bearings, forcausing the spindle and shaft to rotate in unison, said gearingincluding two normally stationary annular racks, one of which isadjustable to cause rotation of the shaft relatively to the spindle, anda motor geared to the latter rack.

4. The combination with a. lathe head having bearings, a hollow spindleprojecting through the bearings and a chuck on said spindle, of a shaftjournaled in and extending through the spindle, connections between saidshaft and the chuck jaws for operating the jaws when the shaft isrotated relatively to the spindle, gears on the spindle and shaft, astationary annular rack, having internal teeth, surrounding the formergear, an adjustable annular rack, having internal and external teeth,surrounding the latter ear, a carrier rotatable about the axis 0 thespindle and having two sets of idle gears, one'set engaging the gear onthe spindle and the stationary rack and the other set engagin the gearon the shaft and the adjustabl le rack, and a motor geared to saidlatter rac 5. The combination with a lathe head having bearings, ahollow spindle projecting through the bearings, and a chuck on saidspindle at one side of the bearings, of a shaft journaled in andextending through the spmdle, connections between said shaft and t echuck jaws for operating the jaws when the shaftis rotated relatively tothe spindle,

atinos gears on the spindle and shaft, at the other sets of idle gears,one set engaging the gear side of said bearings, a stationary annular onthe spindle and the stationary rack and rack, having internal teeth,surrounding the the other set engaging the gear on the shaft 10 formergear, an adjustable annular rack, and, the adjustable rack, and a motorgeared 5' having internal and external teeth, surto said latter rack.

roundingthe latter gear, a carrier rotatable lln testimony whereof Ia-ffix my signature. about the axis of the spindle and having two HOWARDMORTON HAY.

